energyCalc/energyCorrection [ Subroutines ]

Gets the finalState particles with vacuum kinematics in the CM Frame.
Also the real srts of the final state is handed over to the routine.
Then this routine tries to solve energy and momentum conservation by the
ansatz described in
the cross section documentation. .
Therefore it evaluates the scaling factor "x" which is used to scale the
CM-momenta of the final states. This is done by a Regula-Falsi-Method.
We search of a zero of the function "deltaSrts" which depends on this
scaling factor x.

IMPORTANT :
Output are the final state particles in the calculation frame!